ISSN:
0392-6737
Keywords:
Transport properties
;
Low-field and Townsend discharges
;
Transport processes: theory
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Summary TheP 1 approximation to the Boltzmann equation in the case of slightly ionized gases leads to the usual Fokker-Planck equation whose solution in steady-state condition is the Chapman-Cowling-Davydov (CCD) expression. We have extended the same procedure to include electron-ion interactions when the corresponding collision frequency is of the same order of, or larger than, the electron-neutral molecule collision frequency. We have considered a case where, after an initial ionization of a column of gas, the majority of the electrons have diffused to, and have been captured by, the walls of the chamber so that we may neglect the electron-electron interactions. We have found a modified CCD expression. However, numerical calculations show that the differences between the modified expressions and the standard ones in which the electron-ion collision frequency for momentum transfer is added to the electron-neutral collision frequency are beyond the present experimental accuracy.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02463830
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